Lahan kering untuk pertanian pada umumnya berada di daerah lereng dan perbukitan dengan kondisi tanah yang peka terhadap pergerusan tanah akibat limpasan permukaan. Salah satu upaya konservasi pada lahan kering berlereng untuk mengurangi limpasan permukaan adalah dengan penggunaan aplikasi hidromulsa dan geojute. Tujuan dari penelitian ini adalah untuk mengetahui kemampuan aplikasi hidromulsa dan geojute pada budidaya jagung terhadap jumlah limpasan permukaan. Penelitian ini dilakukan di Lahan Kering Ciparanje, Jatinangor. Perlakuan yang digunakan diantaranya plot A dengan menggunakan geojute mesh 5 cm dan hidromulsa, plot B dengan menggunakan geojute mesh 3 cm dan hidromulsa, plot C menggunakan hidromulsa tanpa geojute, dan plot D sebagai kontrol tanpa menggunakan geojute maupun hidromulsa. Pengamatan limpasan permukaan dilakukan setiap kejadian hujan. Metode yang digunakan deskriptif dengan analisis regresi dan uji-T. Hasil penelitian menunjukkan bahwa kombinasi hidromulsa dengan geojute mesh 5 cm dapat menurunkan limpasan permukaan paling optimal sebesar 66,39%, tetapi aplikasi hidromulsa tanpa penggunaan geojute menghasilkan jumlah limpasan permukaan yang tinggi.

The increase of human population impact to more land needed for residence and has an impact on the decreasing land for agriculture, especially in urban areas. One of solution for farming in urban areas is by utilizing rooftop farming by hydroponic cultivation. The hydroponic system that used in this research is floating raft system. This study aims to determine the performance of the floating raft fertigation system which includes the amount of energy consumption, water, nutrient solution, growth uniformity and yield productivity in water spinach cultivation using floating raft fertigation system for one period of growth. This research was carried out on the rooftop of the building of the Food Industry Technology Department of Padjadjaran University with descriptive analysis method. The parameters measured in this study were the amount of water consumption, nutrition and electrical energy from the floating raft fertigation system that was used and uniformity of the results of plant growth including plant height, root length and plant weight at harvest determined in this study, 16 days after transplanting. Result showed that water consumption for one time growth period water spinach was 300,63 liters; consumption of nutrients was 3860 ml and electricity consumption was 31,816 kW. The uniformity of water spinach plant results of the study was in the category of good. The efficiency of water use was 99.6 kg/m3 and plant productivity based on research results is 72.8 kg/m2.

Sediment discharge monitoring can be used to detect sediment disasters in upstream areas in order to enable prompt countermeasures. Sediment disaster signals should be easily differentiated from ordinary sediment discharge. This study examined the application of the geospatial interface for the Water Erosion Prediction Project (GeoWEPP) for the assessment of baseline sediment discharge in a mountain watershed to allow early detection of upstream sediment disasters. When compared to detailed observation-based data from the Agatsuma watershed, GeoWEPP successfully reproduced continuous sediment discharge in subwatersheds of varying size, topography, and land use. GeoWEPP parameter settings corresponded to actual conditions and processes involved in water and sediment dynamics. Additionally, the introduction of a restrictive layer and improved settings for evapotranspiration rate were critical for predicting surface runoff and subsequent surface erosion in hillslope sections. The depth to non-erodible layer was important for determining the overall sediment discharge at the study site, as it was the only parameter that varied over time and could not be obtained from the actual depth of bed material. This parameter should be interpreted as a conceptual index that represents the spatial distribution of bed material and its erodibility, and requires an initial adjustment period. Therefore, GeoWEPP calculations should eliminate the first year in order to obtain optimal results in a mountain watershed with a significant depth of bed material in a channel section.

Hydroponics has great potential to improve the sustainability of food supplies in various regions presently and in the future. However, studies on proposed hydroponic technology specifically for remote areas are still very limited, with the majority focusing on urban areas. Limited resources, such as electricity supply, are the main obstacles to implementing hydroponics in remote areas. Therefore, this study proposes a breakthrough in hydroponic technology based on a self-fertigation system that can work without electricity for effective and efficient plant growth. This study employs a descriptive quantitative methodology. The proposed hydroponic technology was applied to spinach (Amaranthus dubius) with green and red varieties, from January to April 2021 during the wet season in the tropical climate of Indonesia. Spinach seeds were sown and placed at the nursery for 10 days in net pots containing rockwool of 25 mm of cubes growth media, and then transferred to a hydroponic kit until harvesting. Based on the analysis, microclimate conditions had a safe range and were consistent with plant growth standards. The modified hydroponic kit provided good fertigation quality including temperature, electrical conductivity, potential hydrogen and dissolved oxygen for spinach plants. The total fertigation consumption amounted to 46.64 L during the 20 days of planting (equal to 0.012 L/plant day−1) with low evapotranspiration (0.89 mm/day). In addition, green spinach had higher productivity of 1.34 kg/m2 than red at 0.71 kg/m2. The nutritional analysis results also showed that green spinach is superior for calcium, iron, phosphor, and vitamin C, while red is superior for potassium and magnesium. The hydroponic kit was used successfully to cultivate spinach plants with good morphological and nutritional qualities. This type of technology has a bright outlook for the near future and must be continuously developed.